➤ calculate manning roughness coefficient
➤ calculate flow rate
➤ calculate hydraulic radius
➤ calculate line slope
calculate manning roughness coefficient
calculate flow rate
calculate hydraulic radius
calculate line slope
manning's formula is an empirical formula that indicates the flow rate or flow rate of a canal. it is often used in physical calculations, water conservancy construction and other activities. manning's formula is a widely applicable formula, but if the fluid in the open channel is a constant uniform flow and a constant slowly varying flow, we can use the simpler form of sheetsa's formula to calculate the flow rate.
manning's formula: an empirical formula for open channel flow or velocity. where v is the velocity;
k is the si unit conversion constant, with a value of 1;
n is roughness, which is a coefficient that comprehensively reflects the impact of pipe and channel wall roughness on water flow. its value is generally measured from experimental data, and can be selected by looking up the table when using it. there are some useful n values to choose from in the further reading url:
rh is the hydraulic radius, which is the ratio of the fluid cross-sectional area to the wetted perimeter. the wetted perimeter refers to the perimeter where the fluid is in contact with the open channel section, excluding the perimeter where it is in contact with the air;
s represents the slope of the channel.